1 files changed, 535 insertions, 176 deletions

diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index 8b905161fbf..e27cec25c59 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -2,57 +2,135 @@
  * DMA Engine test module
  *
  * Copyright (C) 2007 Atmel Corporation
+ * Copyright (C) 2013 Intel Corporation
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/delay.h>
+#include <linux/dma-mapping.h>
 #include <linux/dmaengine.h>
+#include <linux/freezer.h>
 #include <linux/init.h>
 #include <linux/kthread.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/random.h>
+#include <linux/slab.h>
 #include <linux/wait.h>
 
 static unsigned int test_buf_size = 16384;
-module_param(test_buf_size, uint, S_IRUGO);
+module_param(test_buf_size, uint, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(test_buf_size, "Size of the memcpy test buffer");
 
 static char test_channel[20];
-module_param_string(channel, test_channel, sizeof(test_channel), S_IRUGO);
+module_param_string(channel, test_channel, sizeof(test_channel),
+		S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(channel, "Bus ID of the channel to test (default: any)");
 
-static char test_device[20];
-module_param_string(device, test_device, sizeof(test_device), S_IRUGO);
+static char test_device[32];
+module_param_string(device, test_device, sizeof(test_device),
+		S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(device, "Bus ID of the DMA Engine to test (default: any)");
 
 static unsigned int threads_per_chan = 1;
-module_param(threads_per_chan, uint, S_IRUGO);
+module_param(threads_per_chan, uint, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(threads_per_chan,
 		"Number of threads to start per channel (default: 1)");
 
 static unsigned int max_channels;
-module_param(max_channels, uint, S_IRUGO);
+module_param(max_channels, uint, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(max_channels,
 		"Maximum number of channels to use (default: all)");
 
 static unsigned int iterations;
-module_param(iterations, uint, S_IRUGO);
+module_param(iterations, uint, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(iterations,
 		"Iterations before stopping test (default: infinite)");
 
 static unsigned int xor_sources = 3;
-module_param(xor_sources, uint, S_IRUGO);
+module_param(xor_sources, uint, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(xor_sources,
 		"Number of xor source buffers (default: 3)");
 
 static unsigned int pq_sources = 3;
-module_param(pq_sources, uint, S_IRUGO);
+module_param(pq_sources, uint, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(pq_sources,
 		"Number of p+q source buffers (default: 3)");
 
+static int timeout = 3000;
+module_param(timeout, uint, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(timeout, "Transfer Timeout in msec (default: 3000), "
+		 "Pass -1 for infinite timeout");
+
+static bool noverify;
+module_param(noverify, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(noverify, "Disable random data setup and verification");
+
+static bool verbose;
+module_param(verbose, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(verbose, "Enable \"success\" result messages (default: off)");
+
+/**
+ * struct dmatest_params - test parameters.
+ * @buf_size:		size of the memcpy test buffer
+ * @channel:		bus ID of the channel to test
+ * @device:		bus ID of the DMA Engine to test
+ * @threads_per_chan:	number of threads to start per channel
+ * @max_channels:	maximum number of channels to use
+ * @iterations:		iterations before stopping test
+ * @xor_sources:	number of xor source buffers
+ * @pq_sources:		number of p+q source buffers
+ * @timeout:		transfer timeout in msec, -1 for infinite timeout
+ */
+struct dmatest_params {
+	unsigned int	buf_size;
+	char		channel[20];
+	char		device[32];
+	unsigned int	threads_per_chan;
+	unsigned int	max_channels;
+	unsigned int	iterations;
+	unsigned int	xor_sources;
+	unsigned int	pq_sources;
+	int		timeout;
+	bool		noverify;
+};
+
+/**
+ * struct dmatest_info - test information.
+ * @params:		test parameters
+ * @lock:		access protection to the fields of this structure
+ */
+static struct dmatest_info {
+	/* Test parameters */
+	struct dmatest_params	params;
+
+	/* Internal state */
+	struct list_head	channels;
+	unsigned int		nr_channels;
+	struct mutex		lock;
+	bool			did_init;
+} test_info = {
+	.channels = LIST_HEAD_INIT(test_info.channels),
+	.lock = __MUTEX_INITIALIZER(test_info.lock),
+};
+
+static int dmatest_run_set(const char *val, const struct kernel_param *kp);
+static int dmatest_run_get(char *val, const struct kernel_param *kp);
+static struct kernel_param_ops run_ops = {
+	.set = dmatest_run_set,
+	.get = dmatest_run_get,
+};
+static bool dmatest_run;
+module_param_cb(run, &run_ops, &dmatest_run, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(run, "Run the test (default: false)");
+
+/* Maximum amount of mismatched bytes in buffer to print */
+#define MAX_ERROR_COUNT		32
+
 /*
  * Initialization patterns. All bytes in the source buffer has bit 7
  * set, all bytes in the destination buffer has bit 7 cleared.
@@ -72,11 +150,13 @@ MODULE_PARM_DESC(pq_sources,
 
 struct dmatest_thread {
 	struct list_head	node;
+	struct dmatest_info	*info;
 	struct task_struct	*task;
 	struct dma_chan		*chan;
 	u8			**srcs;
 	u8			**dsts;
 	enum dma_transaction_type type;
+	bool			done;
 };
 
 struct dmatest_chan {
@@ -85,36 +165,69 @@ struct dmatest_chan {
 	struct list_head	threads;
 };
 
-/*
- * These are protected by dma_list_mutex since they're only used by
- * the DMA filter function callback
- */
-static LIST_HEAD(dmatest_channels);
-static unsigned int nr_channels;
+static DECLARE_WAIT_QUEUE_HEAD(thread_wait);
+static bool wait;
 
-static bool dmatest_match_channel(struct dma_chan *chan)
+static bool is_threaded_test_run(struct dmatest_info *info)
 {
-	if (test_channel[0] == '\0')
+	struct dmatest_chan *dtc;
+
+	list_for_each_entry(dtc, &info->channels, node) {
+		struct dmatest_thread *thread;
+
+		list_for_each_entry(thread, &dtc->threads, node) {
+			if (!thread->done)
+				return true;
+		}
+	}
+
+	return false;
+}
+
+static int dmatest_wait_get(char *val, const struct kernel_param *kp)
+{
+	struct dmatest_info *info = &test_info;
+	struct dmatest_params *params = &info->params;
+
+	if (params->iterations)
+		wait_event(thread_wait, !is_threaded_test_run(info));
+	wait = true;
+	return param_get_bool(val, kp);
+}
+
+static struct kernel_param_ops wait_ops = {
+	.get = dmatest_wait_get,
+	.set = param_set_bool,
+};
+module_param_cb(wait, &wait_ops, &wait, S_IRUGO);
+MODULE_PARM_DESC(wait, "Wait for tests to complete (default: false)");
+
+static bool dmatest_match_channel(struct dmatest_params *params,
+		struct dma_chan *chan)
+{
+	if (params->channel[0] == '\0')
 		return true;
-	return strcmp(dma_chan_name(chan), test_channel) == 0;
+	return strcmp(dma_chan_name(chan), params->channel) == 0;
 }
 
-static bool dmatest_match_device(struct dma_device *device)
+static bool dmatest_match_device(struct dmatest_params *params,
+		struct dma_device *device)
 {
-	if (test_device[0] == '\0')
+	if (params->device[0] == '\0')
 		return true;
-	return strcmp(dev_name(device->dev), test_device) == 0;
+	return strcmp(dev_name(device->dev), params->device) == 0;
 }
 
 static unsigned long dmatest_random(void)
 {
 	unsigned long buf;
 
-	get_random_bytes(&buf, sizeof(buf));
+	prandom_bytes(&buf, sizeof(buf));
 	return buf;
 }
 
-static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len)
+static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len,
+		unsigned int buf_size)
 {
 	unsigned int i;
 	u8 *buf;
@@ -125,13 +238,14 @@ static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len)
 		for ( ; i < start + len; i++)
 			buf[i] = PATTERN_SRC | PATTERN_COPY
 				| (~i & PATTERN_COUNT_MASK);
-		for ( ; i < test_buf_size; i++)
+		for ( ; i < buf_size; i++)
 			buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK);
 		buf++;
 	}
 }
 
-static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len)
+static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len,
+		unsigned int buf_size)
 {
 	unsigned int i;
 	u8 *buf;
@@ -142,7 +256,7 @@ static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len)
 		for ( ; i < start + len; i++)
 			buf[i] = PATTERN_DST | PATTERN_OVERWRITE
 				| (~i & PATTERN_COUNT_MASK);
-		for ( ; i < test_buf_size; i++)
+		for ( ; i < buf_size; i++)
 			buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK);
 	}
 }
@@ -155,22 +269,18 @@ static void dmatest_mismatch(u8 actual, u8 pattern, unsigned int index,
 	const char	*thread_name = current->comm;
 
 	if (is_srcbuf)
-		pr_warning("%s: srcbuf[0x%x] overwritten!"
-				" Expected %02x, got %02x\n",
-				thread_name, index, expected, actual);
+		pr_warn("%s: srcbuf[0x%x] overwritten! Expected %02x, got %02x\n",
+			thread_name, index, expected, actual);
 	else if ((pattern & PATTERN_COPY)
 			&& (diff & (PATTERN_COPY | PATTERN_OVERWRITE)))
-		pr_warning("%s: dstbuf[0x%x] not copied!"
-				" Expected %02x, got %02x\n",
-				thread_name, index, expected, actual);
+		pr_warn("%s: dstbuf[0x%x] not copied! Expected %02x, got %02x\n",
+			thread_name, index, expected, actual);
 	else if (diff & PATTERN_SRC)
-		pr_warning("%s: dstbuf[0x%x] was copied!"
-				" Expected %02x, got %02x\n",
-				thread_name, index, expected, actual);
+		pr_warn("%s: dstbuf[0x%x] was copied! Expected %02x, got %02x\n",
+			thread_name, index, expected, actual);
 	else
-		pr_warning("%s: dstbuf[0x%x] mismatch!"
-				" Expected %02x, got %02x\n",
-				thread_name, index, expected, actual);
+		pr_warn("%s: dstbuf[0x%x] mismatch! Expected %02x, got %02x\n",
+			thread_name, index, expected, actual);
 }
 
 static unsigned int dmatest_verify(u8 **bufs, unsigned int start,
@@ -190,7 +300,7 @@ static unsigned int dmatest_verify(u8 **bufs, unsigned int start,
 			actual = buf[i];
 			expected = pattern | (~counter & PATTERN_COUNT_MASK);
 			if (actual != expected) {
-				if (error_count < 32)
+				if (error_count < MAX_ERROR_COUNT)
 					dmatest_mismatch(actual, pattern, i,
 							 counter, is_srcbuf);
 				error_count++;
@@ -199,16 +309,77 @@ static unsigned int dmatest_verify(u8 **bufs, unsigned int start,
 		}
 	}
 
-	if (error_count > 32)
-		pr_warning("%s: %u errors suppressed\n",
-			current->comm, error_count - 32);
+	if (error_count > MAX_ERROR_COUNT)
+		pr_warn("%s: %u errors suppressed\n",
+			current->comm, error_count - MAX_ERROR_COUNT);
 
 	return error_count;
 }
 
-static void dmatest_callback(void *completion)
+/* poor man's completion - we want to use wait_event_freezable() on it */
+struct dmatest_done {
+	bool			done;
+	wait_queue_head_t	*wait;
+};
+
+static void dmatest_callback(void *arg)
 {
-	complete(completion);
+	struct dmatest_done *done = arg;
+
+	done->done = true;
+	wake_up_all(done->wait);
+}
+
+static unsigned int min_odd(unsigned int x, unsigned int y)
+{
+	unsigned int val = min(x, y);
+
+	return val % 2 ? val : val - 1;
+}
+
+static void result(const char *err, unsigned int n, unsigned int src_off,
+		   unsigned int dst_off, unsigned int len, unsigned long data)
+{
+	pr_info("%s: result #%u: '%s' with src_off=0x%x dst_off=0x%x len=0x%x (%lu)\n",
+		current->comm, n, err, src_off, dst_off, len, data);
+}
+
+static void dbg_result(const char *err, unsigned int n, unsigned int src_off,
+		       unsigned int dst_off, unsigned int len,
+		       unsigned long data)
+{
+	pr_debug("%s: result #%u: '%s' with src_off=0x%x dst_off=0x%x len=0x%x (%lu)\n",
+		   current->comm, n, err, src_off, dst_off, len, data);
+}
+
+#define verbose_result(err, n, src_off, dst_off, len, data) ({ \
+	if (verbose) \
+		result(err, n, src_off, dst_off, len, data); \
+	else \
+		dbg_result(err, n, src_off, dst_off, len, data); \
+})
+
+static unsigned long long dmatest_persec(s64 runtime, unsigned int val)
+{
+	unsigned long long per_sec = 1000000;
+
+	if (runtime <= 0)
+		return 0;
+
+	/* drop precision until runtime is 32-bits */
+	while (runtime > UINT_MAX) {
+		runtime >>= 1;
+		per_sec <<= 1;
+	}
+
+	per_sec *= val;
+	do_div(per_sec, runtime);
+	return per_sec;
+}
+
+static unsigned long long dmatest_KBs(s64 runtime, unsigned long long len)
+{
+	return dmatest_persec(runtime, len >> 10);
 }
 
 /*
@@ -227,9 +398,13 @@ static void dmatest_callback(void *completion)
  */
 static int dmatest_func(void *data)
 {
+	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(done_wait);
 	struct dmatest_thread	*thread = data;
+	struct dmatest_done	done = { .wait = &done_wait };
+	struct dmatest_info	*info;
+	struct dmatest_params	*params;
 	struct dma_chan		*chan;
-	const char		*thread_name;
+	struct dma_device	*dev;
 	unsigned int		src_off, dst_off, len;
 	unsigned int		error_count;
 	unsigned int		failed_tests = 0;
@@ -237,36 +412,49 @@ static int dmatest_func(void *data)
 	dma_cookie_t		cookie;
 	enum dma_status		status;
 	enum dma_ctrl_flags 	flags;
-	u8			pq_coefs[pq_sources];
+	u8			*pq_coefs = NULL;
 	int			ret;
 	int			src_cnt;
 	int			dst_cnt;
 	int			i;
+	ktime_t			ktime;
+	s64			runtime = 0;
+	unsigned long long	total_len = 0;
 
-	thread_name = current->comm;
+	set_freezable();
 
 	ret = -ENOMEM;
 
 	smp_rmb();
+	info = thread->info;
+	params = &info->params;
 	chan = thread->chan;
+	dev = chan->device;
 	if (thread->type == DMA_MEMCPY)
 		src_cnt = dst_cnt = 1;
 	else if (thread->type == DMA_XOR) {
-		src_cnt = xor_sources | 1; /* force odd to ensure dst = src */
+		/* force odd to ensure dst = src */
+		src_cnt = min_odd(params->xor_sources | 1, dev->max_xor);
 		dst_cnt = 1;
 	} else if (thread->type == DMA_PQ) {
-		src_cnt = pq_sources | 1; /* force odd to ensure dst = src */
+		/* force odd to ensure dst = src */
+		src_cnt = min_odd(params->pq_sources | 1, dma_maxpq(dev, 0));
 		dst_cnt = 2;
-		for (i = 0; i < pq_sources; i++)
+
+		pq_coefs = kmalloc(params->pq_sources+1, GFP_KERNEL);
+		if (!pq_coefs)
+			goto err_thread_type;
+
+		for (i = 0; i < src_cnt; i++)
 			pq_coefs[i] = 1;
 	} else
-		goto err_srcs;
+		goto err_thread_type;
 
 	thread->srcs = kcalloc(src_cnt+1, sizeof(u8 *), GFP_KERNEL);
 	if (!thread->srcs)
 		goto err_srcs;
 	for (i = 0; i < src_cnt; i++) {
-		thread->srcs[i] = kmalloc(test_buf_size, GFP_KERNEL);
+		thread->srcs[i] = kmalloc(params->buf_size, GFP_KERNEL);
 		if (!thread->srcs[i])
 			goto err_srcbuf;
 	}
@@ -276,7 +464,7 @@ static int dmatest_func(void *data)
 	if (!thread->dsts)
 		goto err_dsts;
 	for (i = 0; i < dst_cnt; i++) {
-		thread->dsts[i] = kmalloc(test_buf_size, GFP_KERNEL);
+		thread->dsts[i] = kmalloc(params->buf_size, GFP_KERNEL);
 		if (!thread->dsts[i])
 			goto err_dstbuf;
 	}
@@ -284,16 +472,18 @@ static int dmatest_func(void *data)
 
 	set_user_nice(current, 10);
 
-	flags = DMA_CTRL_ACK | DMA_COMPL_SKIP_DEST_UNMAP | DMA_PREP_INTERRUPT;
+	/*
+	 * src and dst buffers are freed by ourselves below
+	 */
+	flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
 
+	ktime = ktime_get();
 	while (!kthread_should_stop()
-	       && !(iterations && total_tests >= iterations)) {
-		struct dma_device *dev = chan->device;
+	       && !(params->iterations && total_tests >= params->iterations)) {
 		struct dma_async_tx_descriptor *tx = NULL;
-		dma_addr_t dma_srcs[src_cnt];
-		dma_addr_t dma_dsts[dst_cnt];
-		struct completion cmp;
-		unsigned long tmo = msecs_to_jiffies(3000);
+		struct dmaengine_unmap_data *um;
+		dma_addr_t srcs[src_cnt];
+		dma_addr_t *dsts;
 		u8 align = 0;
 
 		total_tests++;
@@ -306,150 +496,196 @@ static int dmatest_func(void *data)
 		else if (thread->type == DMA_PQ)
 			align = dev->pq_align;
 
-		if (1 << align > test_buf_size) {
+		if (1 << align > params->buf_size) {
 			pr_err("%u-byte buffer too small for %d-byte alignment\n",
-			       test_buf_size, 1 << align);
+			       params->buf_size, 1 << align);
 			break;
 		}
 
-		len = dmatest_random() % test_buf_size + 1;
+		if (params->noverify) {
+			len = params->buf_size;
+			src_off = 0;
+			dst_off = 0;
+		} else {
+			len = dmatest_random() % params->buf_size + 1;
+			len = (len >> align) << align;
+			if (!len)
+				len = 1 << align;
+			src_off = dmatest_random() % (params->buf_size - len + 1);
+			dst_off = dmatest_random() % (params->buf_size - len + 1);
+
+			src_off = (src_off >> align) << align;
+			dst_off = (dst_off >> align) << align;
+
+			dmatest_init_srcs(thread->srcs, src_off, len,
+					  params->buf_size);
+			dmatest_init_dsts(thread->dsts, dst_off, len,
+					  params->buf_size);
+		}
+
 		len = (len >> align) << align;
 		if (!len)
 			len = 1 << align;
-		src_off = dmatest_random() % (test_buf_size - len + 1);
-		dst_off = dmatest_random() % (test_buf_size - len + 1);
+		total_len += len;
 
-		src_off = (src_off >> align) << align;
-		dst_off = (dst_off >> align) << align;
-
-		dmatest_init_srcs(thread->srcs, src_off, len);
-		dmatest_init_dsts(thread->dsts, dst_off, len);
+		um = dmaengine_get_unmap_data(dev->dev, src_cnt+dst_cnt,
+					      GFP_KERNEL);
+		if (!um) {
+			failed_tests++;
+			result("unmap data NULL", total_tests,
+			       src_off, dst_off, len, ret);
+			continue;
+		}
 
+		um->len = params->buf_size;
 		for (i = 0; i < src_cnt; i++) {
-			u8 *buf = thread->srcs[i] + src_off;
-
-			dma_srcs[i] = dma_map_single(dev->dev, buf, len,
-						     DMA_TO_DEVICE);
+			void *buf = thread->srcs[i];
+			struct page *pg = virt_to_page(buf);
+			unsigned pg_off = (unsigned long) buf & ~PAGE_MASK;
+
+			um->addr[i] = dma_map_page(dev->dev, pg, pg_off,
+						   um->len, DMA_TO_DEVICE);
+			srcs[i] = um->addr[i] + src_off;
+			ret = dma_mapping_error(dev->dev, um->addr[i]);
+			if (ret) {
+				dmaengine_unmap_put(um);
+				result("src mapping error", total_tests,
+				       src_off, dst_off, len, ret);
+				failed_tests++;
+				continue;
+			}
+			um->to_cnt++;
 		}
 		/* map with DMA_BIDIRECTIONAL to force writeback/invalidate */
+		dsts = &um->addr[src_cnt];
 		for (i = 0; i < dst_cnt; i++) {
-			dma_dsts[i] = dma_map_single(dev->dev, thread->dsts[i],
-						     test_buf_size,
-						     DMA_BIDIRECTIONAL);
+			void *buf = thread->dsts[i];
+			struct page *pg = virt_to_page(buf);
+			unsigned pg_off = (unsigned long) buf & ~PAGE_MASK;
+
+			dsts[i] = dma_map_page(dev->dev, pg, pg_off, um->len,
+					       DMA_BIDIRECTIONAL);
+			ret = dma_mapping_error(dev->dev, dsts[i]);
+			if (ret) {
+				dmaengine_unmap_put(um);
+				result("dst mapping error", total_tests,
+				       src_off, dst_off, len, ret);
+				failed_tests++;
+				continue;
+			}
+			um->bidi_cnt++;
 		}
 
-
 		if (thread->type == DMA_MEMCPY)
 			tx = dev->device_prep_dma_memcpy(chan,
-							 dma_dsts[0] + dst_off,
-							 dma_srcs[0], len,
-							 flags);
+							 dsts[0] + dst_off,
+							 srcs[0], len, flags);
 		else if (thread->type == DMA_XOR)
 			tx = dev->device_prep_dma_xor(chan,
-						      dma_dsts[0] + dst_off,
-						      dma_srcs, xor_sources,
+						      dsts[0] + dst_off,
+						      srcs, src_cnt,
 						      len, flags);
 		else if (thread->type == DMA_PQ) {
 			dma_addr_t dma_pq[dst_cnt];
 
 			for (i = 0; i < dst_cnt; i++)
-				dma_pq[i] = dma_dsts[i] + dst_off;
-			tx = dev->device_prep_dma_pq(chan, dma_pq, dma_srcs,
-						     pq_sources, pq_coefs,
+				dma_pq[i] = dsts[i] + dst_off;
+			tx = dev->device_prep_dma_pq(chan, dma_pq, srcs,
+						     src_cnt, pq_coefs,
 						     len, flags);
 		}
 
 		if (!tx) {
-			for (i = 0; i < src_cnt; i++)
-				dma_unmap_single(dev->dev, dma_srcs[i], len,
-						 DMA_TO_DEVICE);
-			for (i = 0; i < dst_cnt; i++)
-				dma_unmap_single(dev->dev, dma_dsts[i],
-						 test_buf_size,
-						 DMA_BIDIRECTIONAL);
-			pr_warning("%s: #%u: prep error with src_off=0x%x "
-					"dst_off=0x%x len=0x%x\n",
-					thread_name, total_tests - 1,
-					src_off, dst_off, len);
+			dmaengine_unmap_put(um);
+			result("prep error", total_tests, src_off,
+			       dst_off, len, ret);
 			msleep(100);
 			failed_tests++;
 			continue;
 		}
 
-		init_completion(&cmp);
+		done.done = false;
 		tx->callback = dmatest_callback;
-		tx->callback_param = &cmp;
+		tx->callback_param = &done;
 		cookie = tx->tx_submit(tx);
 
 		if (dma_submit_error(cookie)) {
-			pr_warning("%s: #%u: submit error %d with src_off=0x%x "
-					"dst_off=0x%x len=0x%x\n",
-					thread_name, total_tests - 1, cookie,
-					src_off, dst_off, len);
+			dmaengine_unmap_put(um);
+			result("submit error", total_tests, src_off,
+			       dst_off, len, ret);
 			msleep(100);
 			failed_tests++;
 			continue;
 		}
 		dma_async_issue_pending(chan);
 
-		tmo = wait_for_completion_timeout(&cmp, tmo);
+		wait_event_freezable_timeout(done_wait, done.done,
+					     msecs_to_jiffies(params->timeout));
+
 		status = dma_async_is_tx_complete(chan, cookie, NULL, NULL);
 
-		if (tmo == 0) {
-			pr_warning("%s: #%u: test timed out\n",
-				   thread_name, total_tests - 1);
+		if (!done.done) {
+			/*
+			 * We're leaving the timed out dma operation with
+			 * dangling pointer to done_wait.  To make this
+			 * correct, we'll need to allocate wait_done for
+			 * each test iteration and perform "who's gonna
+			 * free it this time?" dancing.  For now, just
+			 * leave it dangling.
+			 */
+			dmaengine_unmap_put(um);
+			result("test timed out", total_tests, src_off, dst_off,
+			       len, 0);
 			failed_tests++;
 			continue;
-		} else if (status != DMA_SUCCESS) {
-			pr_warning("%s: #%u: got completion callback,"
-				   " but status is \'%s\'\n",
-				   thread_name, total_tests - 1,
-				   status == DMA_ERROR ? "error" : "in progress");
+		} else if (status != DMA_COMPLETE) {
+			dmaengine_unmap_put(um);
+			result(status == DMA_ERROR ?
+			       "completion error status" :
+			       "completion busy status", total_tests, src_off,
+			       dst_off, len, ret);
 			failed_tests++;
 			continue;
 		}
 
-		/* Unmap by myself (see DMA_COMPL_SKIP_DEST_UNMAP above) */
-		for (i = 0; i < dst_cnt; i++)
-			dma_unmap_single(dev->dev, dma_dsts[i], test_buf_size,
-					 DMA_BIDIRECTIONAL);
+		dmaengine_unmap_put(um);
 
-		error_count = 0;
+		if (params->noverify) {
+			verbose_result("test passed", total_tests, src_off,
+				       dst_off, len, 0);
+			continue;
+		}
 
-		pr_debug("%s: verifying source buffer...\n", thread_name);
-		error_count += dmatest_verify(thread->srcs, 0, src_off,
+		pr_debug("%s: verifying source buffer...\n", current->comm);
+		error_count = dmatest_verify(thread->srcs, 0, src_off,
 				0, PATTERN_SRC, true);
 		error_count += dmatest_verify(thread->srcs, src_off,
 				src_off + len, src_off,
 				PATTERN_SRC | PATTERN_COPY, true);
 		error_count += dmatest_verify(thread->srcs, src_off + len,
-				test_buf_size, src_off + len,
+				params->buf_size, src_off + len,
 				PATTERN_SRC, true);
 
-		pr_debug("%s: verifying dest buffer...\n",
-				thread->task->comm);
+		pr_debug("%s: verifying dest buffer...\n", current->comm);
 		error_count += dmatest_verify(thread->dsts, 0, dst_off,
 				0, PATTERN_DST, false);
 		error_count += dmatest_verify(thread->dsts, dst_off,
 				dst_off + len, src_off,
 				PATTERN_SRC | PATTERN_COPY, false);
 		error_count += dmatest_verify(thread->dsts, dst_off + len,
-				test_buf_size, dst_off + len,
+				params->buf_size, dst_off + len,
 				PATTERN_DST, false);
 
 		if (error_count) {
-			pr_warning("%s: #%u: %u errors with "
-				"src_off=0x%x dst_off=0x%x len=0x%x\n",
-				thread_name, total_tests - 1, error_count,
-				src_off, dst_off, len);
+			result("data error", total_tests, src_off, dst_off,
+			       len, error_count);
 			failed_tests++;
 		} else {
-			pr_debug("%s: #%u: No errors with "
-				"src_off=0x%x dst_off=0x%x len=0x%x\n",
-				thread_name, total_tests - 1,
-				src_off, dst_off, len);
+			verbose_result("test passed", total_tests, src_off,
+				       dst_off, len, 0);
 		}
 	}
+	runtime = ktime_us_delta(ktime_get(), ktime);
 
 	ret = 0;
 	for (i = 0; thread->dsts[i]; i++)
@@ -462,14 +698,19 @@ err_dsts:
 err_srcbuf:
 	kfree(thread->srcs);
 err_srcs:
-	pr_notice("%s: terminating after %u tests, %u failures (status %d)\n",
-			thread_name, total_tests, failed_tests, ret);
+	kfree(pq_coefs);
+err_thread_type:
+	pr_info("%s: summary %u tests, %u failures %llu iops %llu KB/s (%d)\n",
+		current->comm, total_tests, failed_tests,
+		dmatest_persec(runtime, total_tests),
+		dmatest_KBs(runtime, total_len), ret);
 
-	if (iterations > 0)
-		while (!kthread_should_stop()) {
-			DECLARE_WAIT_QUEUE_HEAD(wait_dmatest_exit);
-			interruptible_sleep_on(&wait_dmatest_exit);
-		}
+	/* terminate all transfers on specified channels */
+	if (ret)
+		dmaengine_terminate_all(chan);
+
+	thread->done = true;
+	wake_up(&thread_wait);
 
 	return ret;
 }
@@ -482,16 +723,23 @@ static void dmatest_cleanup_channel(struct dmatest_chan *dtc)
 
 	list_for_each_entry_safe(thread, _thread, &dtc->threads, node) {
 		ret = kthread_stop(thread->task);
-		pr_debug("dmatest: thread %s exited with status %d\n",
-				thread->task->comm, ret);
+		pr_debug("thread %s exited with status %d\n",
+			 thread->task->comm, ret);
 		list_del(&thread->node);
+		put_task_struct(thread->task);
 		kfree(thread);
 	}
+
+	/* terminate all transfers on specified channels */
+	dmaengine_terminate_all(dtc->chan);
+
 	kfree(dtc);
 }
 
-static int dmatest_add_threads(struct dmatest_chan *dtc, enum dma_transaction_type type)
+static int dmatest_add_threads(struct dmatest_info *info,
+		struct dmatest_chan *dtc, enum dma_transaction_type type)
 {
+	struct dmatest_params *params = &info->params;
 	struct dmatest_thread *thread;
 	struct dma_chan *chan = dtc->chan;
 	char *op;
@@ -506,44 +754,46 @@ static int dmatest_add_threads(struct dmatest_chan *dtc, enum dma_transaction_ty
 	else
 		return -EINVAL;
 
-	for (i = 0; i < threads_per_chan; i++) {
+	for (i = 0; i < params->threads_per_chan; i++) {
 		thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL);
 		if (!thread) {
-			pr_warning("dmatest: No memory for %s-%s%u\n",
-				   dma_chan_name(chan), op, i);
-
+			pr_warn("No memory for %s-%s%u\n",
+				dma_chan_name(chan), op, i);
 			break;
 		}
+		thread->info = info;
 		thread->chan = dtc->chan;
 		thread->type = type;
 		smp_wmb();
-		thread->task = kthread_run(dmatest_func, thread, "%s-%s%u",
+		thread->task = kthread_create(dmatest_func, thread, "%s-%s%u",
 				dma_chan_name(chan), op, i);
 		if (IS_ERR(thread->task)) {
-			pr_warning("dmatest: Failed to run thread %s-%s%u\n",
-					dma_chan_name(chan), op, i);
+			pr_warn("Failed to create thread %s-%s%u\n",
+				dma_chan_name(chan), op, i);
 			kfree(thread);
 			break;
 		}
 
 		/* srcbuf and dstbuf are allocated by the thread itself */
-
+		get_task_struct(thread->task);
 		list_add_tail(&thread->node, &dtc->threads);
+		wake_up_process(thread->task);
 	}
 
 	return i;
 }
 
-static int dmatest_add_channel(struct dma_chan *chan)
+static int dmatest_add_channel(struct dmatest_info *info,
+		struct dma_chan *chan)
 {
 	struct dmatest_chan	*dtc;
 	struct dma_device	*dma_dev = chan->device;
 	unsigned int		thread_count = 0;
-	unsigned int		cnt;
+	int cnt;
 
 	dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL);
 	if (!dtc) {
-		pr_warning("dmatest: No memory for %s\n", dma_chan_name(chan));
+		pr_warn("No memory for %s\n", dma_chan_name(chan));
 		return -ENOMEM;
 	}
 
@@ -551,77 +801,186 @@ static int dmatest_add_channel(struct dma_chan *chan)
 	INIT_LIST_HEAD(&dtc->threads);
 
 	if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
-		cnt = dmatest_add_threads(dtc, DMA_MEMCPY);
+		cnt = dmatest_add_threads(info, dtc, DMA_MEMCPY);
 		thread_count += cnt > 0 ? cnt : 0;
 	}
 	if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) {
-		cnt = dmatest_add_threads(dtc, DMA_XOR);
+		cnt = dmatest_add_threads(info, dtc, DMA_XOR);
 		thread_count += cnt > 0 ? cnt : 0;
 	}
 	if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) {
-		cnt = dmatest_add_threads(dtc, DMA_PQ);
-		thread_count += cnt > 0 ?: 0;
+		cnt = dmatest_add_threads(info, dtc, DMA_PQ);
+		thread_count += cnt > 0 ? cnt : 0;
 	}
 
-	pr_info("dmatest: Started %u threads using %s\n",
+	pr_info("Started %u threads using %s\n",
 		thread_count, dma_chan_name(chan));
 
-	list_add_tail(&dtc->node, &dmatest_channels);
-	nr_channels++;
+	list_add_tail(&dtc->node, &info->channels);
+	info->nr_channels++;
 
 	return 0;
 }
 
 static bool filter(struct dma_chan *chan, void *param)
 {
-	if (!dmatest_match_channel(chan) || !dmatest_match_device(chan->device))
+	struct dmatest_params *params = param;
+
+	if (!dmatest_match_channel(params, chan) ||
+	    !dmatest_match_device(params, chan->device))
 		return false;
 	else
 		return true;
 }
 
-static int __init dmatest_init(void)
+static void request_channels(struct dmatest_info *info,
+			     enum dma_transaction_type type)
 {
 	dma_cap_mask_t mask;
-	struct dma_chan *chan;
-	int err = 0;
 
 	dma_cap_zero(mask);
-	dma_cap_set(DMA_MEMCPY, mask);
+	dma_cap_set(type, mask);
 	for (;;) {
-		chan = dma_request_channel(mask, filter, NULL);
+		struct dmatest_params *params = &info->params;
+		struct dma_chan *chan;
+
+		chan = dma_request_channel(mask, filter, params);
 		if (chan) {
-			err = dmatest_add_channel(chan);
-			if (err) {
+			if (dmatest_add_channel(info, chan)) {
 				dma_release_channel(chan);
 				break; /* add_channel failed, punt */
 			}
 		} else
 			break; /* no more channels available */
-		if (max_channels && nr_channels >= max_channels)
+		if (params->max_channels &&
+		    info->nr_channels >= params->max_channels)
 			break; /* we have all we need */
 	}
+}
 
-	return err;
+static void run_threaded_test(struct dmatest_info *info)
+{
+	struct dmatest_params *params = &info->params;
+
+	/* Copy test parameters */
+	params->buf_size = test_buf_size;
+	strlcpy(params->channel, strim(test_channel), sizeof(params->channel));
+	strlcpy(params->device, strim(test_device), sizeof(params->device));
+	params->threads_per_chan = threads_per_chan;
+	params->max_channels = max_channels;
+	params->iterations = iterations;
+	params->xor_sources = xor_sources;
+	params->pq_sources = pq_sources;
+	params->timeout = timeout;
+	params->noverify = noverify;
+
+	request_channels(info, DMA_MEMCPY);
+	request_channels(info, DMA_XOR);
+	request_channels(info, DMA_PQ);
 }
-/* when compiled-in wait for drivers to load first */
-late_initcall(dmatest_init);
 
-static void __exit dmatest_exit(void)
+static void stop_threaded_test(struct dmatest_info *info)
 {
 	struct dmatest_chan *dtc, *_dtc;
 	struct dma_chan *chan;
 
-	list_for_each_entry_safe(dtc, _dtc, &dmatest_channels, node) {
+	list_for_each_entry_safe(dtc, _dtc, &info->channels, node) {
 		list_del(&dtc->node);
 		chan = dtc->chan;
 		dmatest_cleanup_channel(dtc);
-		pr_debug("dmatest: dropped channel %s\n",
-			 dma_chan_name(chan));
+		pr_debug("dropped channel %s\n", dma_chan_name(chan));
 		dma_release_channel(chan);
 	}
+
+	info->nr_channels = 0;
+}
+
+static void restart_threaded_test(struct dmatest_info *info, bool run)
+{
+	/* we might be called early to set run=, defer running until all
+	 * parameters have been evaluated
+	 */
+	if (!info->did_init)
+		return;
+
+	/* Stop any running test first */
+	stop_threaded_test(info);
+
+	/* Run test with new parameters */
+	run_threaded_test(info);
+}
+
+static int dmatest_run_get(char *val, const struct kernel_param *kp)
+{
+	struct dmatest_info *info = &test_info;
+
+	mutex_lock(&info->lock);
+	if (is_threaded_test_run(info)) {
+		dmatest_run = true;
+	} else {
+		stop_threaded_test(info);
+		dmatest_run = false;
+	}
+	mutex_unlock(&info->lock);
+
+	return param_get_bool(val, kp);
+}
+
+static int dmatest_run_set(const char *val, const struct kernel_param *kp)
+{
+	struct dmatest_info *info = &test_info;
+	int ret;
+
+	mutex_lock(&info->lock);
+	ret = param_set_bool(val, kp);
+	if (ret) {
+		mutex_unlock(&info->lock);
+		return ret;
+	}
+
+	if (is_threaded_test_run(info))
+		ret = -EBUSY;
+	else if (dmatest_run)
+		restart_threaded_test(info, dmatest_run);
+
+	mutex_unlock(&info->lock);
+
+	return ret;
+}
+
+static int __init dmatest_init(void)
+{
+	struct dmatest_info *info = &test_info;
+	struct dmatest_params *params = &info->params;
+
+	if (dmatest_run) {
+		mutex_lock(&info->lock);
+		run_threaded_test(info);
+		mutex_unlock(&info->lock);
+	}
+
+	if (params->iterations && wait)
+		wait_event(thread_wait, !is_threaded_test_run(info));
+
+	/* module parameters are stable, inittime tests are started,
+	 * let userspace take over 'run' control
+	 */
+	info->did_init = true;
+
+	return 0;
+}
+/* when compiled-in wait for drivers to load first */
+late_initcall(dmatest_init);
+
+static void __exit dmatest_exit(void)
+{
+	struct dmatest_info *info = &test_info;
+
+	mutex_lock(&info->lock);
+	stop_threaded_test(info);
+	mutex_unlock(&info->lock);
 }
 module_exit(dmatest_exit);
 
-MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>");
+MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
 MODULE_LICENSE("GPL v2");